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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2001-2003 Red Hat, Inc. | |
5 | * | |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
10 | * $Id: erase.c,v 1.66 2004/11/16 20:36:11 dwmw2 Exp $ | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/mtd/mtd.h> | |
17 | #include <linux/compiler.h> | |
18 | #include <linux/crc32.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/pagemap.h> | |
21 | #include "nodelist.h" | |
22 | ||
23 | struct erase_priv_struct { | |
24 | struct jffs2_eraseblock *jeb; | |
25 | struct jffs2_sb_info *c; | |
26 | }; | |
27 | ||
28 | #ifndef __ECOS | |
29 | static void jffs2_erase_callback(struct erase_info *); | |
30 | #endif | |
31 | static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset); | |
32 | static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); | |
33 | static void jffs2_free_all_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); | |
34 | static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); | |
35 | ||
36 | static void jffs2_erase_block(struct jffs2_sb_info *c, | |
37 | struct jffs2_eraseblock *jeb) | |
38 | { | |
39 | int ret; | |
40 | uint32_t bad_offset; | |
41 | #ifdef __ECOS | |
42 | ret = jffs2_flash_erase(c, jeb); | |
43 | if (!ret) { | |
44 | jffs2_erase_succeeded(c, jeb); | |
45 | return; | |
46 | } | |
47 | bad_offset = jeb->offset; | |
48 | #else /* Linux */ | |
49 | struct erase_info *instr; | |
50 | ||
51 | instr = kmalloc(sizeof(struct erase_info) + sizeof(struct erase_priv_struct), GFP_KERNEL); | |
52 | if (!instr) { | |
53 | printk(KERN_WARNING "kmalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n"); | |
54 | spin_lock(&c->erase_completion_lock); | |
55 | list_del(&jeb->list); | |
56 | list_add(&jeb->list, &c->erase_pending_list); | |
57 | c->erasing_size -= c->sector_size; | |
58 | c->dirty_size += c->sector_size; | |
59 | jeb->dirty_size = c->sector_size; | |
60 | spin_unlock(&c->erase_completion_lock); | |
61 | return; | |
62 | } | |
63 | ||
64 | memset(instr, 0, sizeof(*instr)); | |
65 | ||
66 | instr->mtd = c->mtd; | |
67 | instr->addr = jeb->offset; | |
68 | instr->len = c->sector_size; | |
69 | instr->callback = jffs2_erase_callback; | |
70 | instr->priv = (unsigned long)(&instr[1]); | |
71 | instr->fail_addr = 0xffffffff; | |
72 | ||
73 | ((struct erase_priv_struct *)instr->priv)->jeb = jeb; | |
74 | ((struct erase_priv_struct *)instr->priv)->c = c; | |
75 | ||
76 | ret = c->mtd->erase(c->mtd, instr); | |
77 | if (!ret) | |
78 | return; | |
79 | ||
80 | bad_offset = instr->fail_addr; | |
81 | kfree(instr); | |
82 | #endif /* __ECOS */ | |
83 | ||
84 | if (ret == -ENOMEM || ret == -EAGAIN) { | |
85 | /* Erase failed immediately. Refile it on the list */ | |
86 | D1(printk(KERN_DEBUG "Erase at 0x%08x failed: %d. Refiling on erase_pending_list\n", jeb->offset, ret)); | |
87 | spin_lock(&c->erase_completion_lock); | |
88 | list_del(&jeb->list); | |
89 | list_add(&jeb->list, &c->erase_pending_list); | |
90 | c->erasing_size -= c->sector_size; | |
91 | c->dirty_size += c->sector_size; | |
92 | jeb->dirty_size = c->sector_size; | |
93 | spin_unlock(&c->erase_completion_lock); | |
94 | return; | |
95 | } | |
96 | ||
97 | if (ret == -EROFS) | |
98 | printk(KERN_WARNING "Erase at 0x%08x failed immediately: -EROFS. Is the sector locked?\n", jeb->offset); | |
99 | else | |
100 | printk(KERN_WARNING "Erase at 0x%08x failed immediately: errno %d\n", jeb->offset, ret); | |
101 | ||
102 | jffs2_erase_failed(c, jeb, bad_offset); | |
103 | } | |
104 | ||
105 | void jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count) | |
106 | { | |
107 | struct jffs2_eraseblock *jeb; | |
108 | ||
109 | down(&c->erase_free_sem); | |
110 | ||
111 | spin_lock(&c->erase_completion_lock); | |
112 | ||
113 | while (!list_empty(&c->erase_complete_list) || | |
114 | !list_empty(&c->erase_pending_list)) { | |
115 | ||
116 | if (!list_empty(&c->erase_complete_list)) { | |
117 | jeb = list_entry(c->erase_complete_list.next, struct jffs2_eraseblock, list); | |
118 | list_del(&jeb->list); | |
119 | spin_unlock(&c->erase_completion_lock); | |
120 | jffs2_mark_erased_block(c, jeb); | |
121 | ||
122 | if (!--count) { | |
123 | D1(printk(KERN_DEBUG "Count reached. jffs2_erase_pending_blocks leaving\n")); | |
124 | goto done; | |
125 | } | |
126 | ||
127 | } else if (!list_empty(&c->erase_pending_list)) { | |
128 | jeb = list_entry(c->erase_pending_list.next, struct jffs2_eraseblock, list); | |
129 | D1(printk(KERN_DEBUG "Starting erase of pending block 0x%08x\n", jeb->offset)); | |
130 | list_del(&jeb->list); | |
131 | c->erasing_size += c->sector_size; | |
132 | c->wasted_size -= jeb->wasted_size; | |
133 | c->free_size -= jeb->free_size; | |
134 | c->used_size -= jeb->used_size; | |
135 | c->dirty_size -= jeb->dirty_size; | |
136 | jeb->wasted_size = jeb->used_size = jeb->dirty_size = jeb->free_size = 0; | |
137 | jffs2_free_all_node_refs(c, jeb); | |
138 | list_add(&jeb->list, &c->erasing_list); | |
139 | spin_unlock(&c->erase_completion_lock); | |
140 | ||
141 | jffs2_erase_block(c, jeb); | |
142 | ||
143 | } else { | |
144 | BUG(); | |
145 | } | |
146 | ||
147 | /* Be nice */ | |
148 | cond_resched(); | |
149 | spin_lock(&c->erase_completion_lock); | |
150 | } | |
151 | ||
152 | spin_unlock(&c->erase_completion_lock); | |
153 | done: | |
154 | D1(printk(KERN_DEBUG "jffs2_erase_pending_blocks completed\n")); | |
155 | ||
156 | up(&c->erase_free_sem); | |
157 | } | |
158 | ||
159 | static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) | |
160 | { | |
161 | D1(printk(KERN_DEBUG "Erase completed successfully at 0x%08x\n", jeb->offset)); | |
162 | spin_lock(&c->erase_completion_lock); | |
163 | list_del(&jeb->list); | |
164 | list_add_tail(&jeb->list, &c->erase_complete_list); | |
165 | spin_unlock(&c->erase_completion_lock); | |
166 | /* Ensure that kupdated calls us again to mark them clean */ | |
167 | jffs2_erase_pending_trigger(c); | |
168 | } | |
169 | ||
170 | static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset) | |
171 | { | |
172 | /* For NAND, if the failure did not occur at the device level for a | |
173 | specific physical page, don't bother updating the bad block table. */ | |
174 | if (jffs2_cleanmarker_oob(c) && (bad_offset != 0xffffffff)) { | |
175 | /* We had a device-level failure to erase. Let's see if we've | |
176 | failed too many times. */ | |
177 | if (!jffs2_write_nand_badblock(c, jeb, bad_offset)) { | |
178 | /* We'd like to give this block another try. */ | |
179 | spin_lock(&c->erase_completion_lock); | |
180 | list_del(&jeb->list); | |
181 | list_add(&jeb->list, &c->erase_pending_list); | |
182 | c->erasing_size -= c->sector_size; | |
183 | c->dirty_size += c->sector_size; | |
184 | jeb->dirty_size = c->sector_size; | |
185 | spin_unlock(&c->erase_completion_lock); | |
186 | return; | |
187 | } | |
188 | } | |
189 | ||
190 | spin_lock(&c->erase_completion_lock); | |
191 | c->erasing_size -= c->sector_size; | |
192 | c->bad_size += c->sector_size; | |
193 | list_del(&jeb->list); | |
194 | list_add(&jeb->list, &c->bad_list); | |
195 | c->nr_erasing_blocks--; | |
196 | spin_unlock(&c->erase_completion_lock); | |
197 | wake_up(&c->erase_wait); | |
198 | } | |
199 | ||
200 | #ifndef __ECOS | |
201 | static void jffs2_erase_callback(struct erase_info *instr) | |
202 | { | |
203 | struct erase_priv_struct *priv = (void *)instr->priv; | |
204 | ||
205 | if(instr->state != MTD_ERASE_DONE) { | |
206 | printk(KERN_WARNING "Erase at 0x%08x finished, but state != MTD_ERASE_DONE. State is 0x%x instead.\n", instr->addr, instr->state); | |
207 | jffs2_erase_failed(priv->c, priv->jeb, instr->fail_addr); | |
208 | } else { | |
209 | jffs2_erase_succeeded(priv->c, priv->jeb); | |
210 | } | |
211 | kfree(instr); | |
212 | } | |
213 | #endif /* !__ECOS */ | |
214 | ||
215 | /* Hmmm. Maybe we should accept the extra space it takes and make | |
216 | this a standard doubly-linked list? */ | |
217 | static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c, | |
218 | struct jffs2_raw_node_ref *ref, struct jffs2_eraseblock *jeb) | |
219 | { | |
220 | struct jffs2_inode_cache *ic = NULL; | |
221 | struct jffs2_raw_node_ref **prev; | |
222 | ||
223 | prev = &ref->next_in_ino; | |
224 | ||
225 | /* Walk the inode's list once, removing any nodes from this eraseblock */ | |
226 | while (1) { | |
227 | if (!(*prev)->next_in_ino) { | |
228 | /* We're looking at the jffs2_inode_cache, which is | |
229 | at the end of the linked list. Stash it and continue | |
230 | from the beginning of the list */ | |
231 | ic = (struct jffs2_inode_cache *)(*prev); | |
232 | prev = &ic->nodes; | |
233 | continue; | |
234 | } | |
235 | ||
236 | if (((*prev)->flash_offset & ~(c->sector_size -1)) == jeb->offset) { | |
237 | /* It's in the block we're erasing */ | |
238 | struct jffs2_raw_node_ref *this; | |
239 | ||
240 | this = *prev; | |
241 | *prev = this->next_in_ino; | |
242 | this->next_in_ino = NULL; | |
243 | ||
244 | if (this == ref) | |
245 | break; | |
246 | ||
247 | continue; | |
248 | } | |
249 | /* Not to be deleted. Skip */ | |
250 | prev = &((*prev)->next_in_ino); | |
251 | } | |
252 | ||
253 | /* PARANOIA */ | |
254 | if (!ic) { | |
255 | printk(KERN_WARNING "inode_cache not found in remove_node_refs()!!\n"); | |
256 | return; | |
257 | } | |
258 | ||
259 | D1(printk(KERN_DEBUG "Removed nodes in range 0x%08x-0x%08x from ino #%u\n", | |
260 | jeb->offset, jeb->offset + c->sector_size, ic->ino)); | |
261 | ||
262 | D2({ | |
263 | int i=0; | |
264 | struct jffs2_raw_node_ref *this; | |
265 | printk(KERN_DEBUG "After remove_node_refs_from_ino_list: \n" KERN_DEBUG); | |
266 | ||
267 | this = ic->nodes; | |
268 | ||
269 | while(this) { | |
270 | printk( "0x%08x(%d)->", ref_offset(this), ref_flags(this)); | |
271 | if (++i == 5) { | |
272 | printk("\n" KERN_DEBUG); | |
273 | i=0; | |
274 | } | |
275 | this = this->next_in_ino; | |
276 | } | |
277 | printk("\n"); | |
278 | }); | |
279 | ||
280 | if (ic->nodes == (void *)ic) { | |
281 | D1(printk(KERN_DEBUG "inocache for ino #%u is all gone now. Freeing\n", ic->ino)); | |
282 | jffs2_del_ino_cache(c, ic); | |
283 | jffs2_free_inode_cache(ic); | |
284 | } | |
285 | } | |
286 | ||
287 | static void jffs2_free_all_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) | |
288 | { | |
289 | struct jffs2_raw_node_ref *ref; | |
290 | D1(printk(KERN_DEBUG "Freeing all node refs for eraseblock offset 0x%08x\n", jeb->offset)); | |
291 | while(jeb->first_node) { | |
292 | ref = jeb->first_node; | |
293 | jeb->first_node = ref->next_phys; | |
294 | ||
295 | /* Remove from the inode-list */ | |
296 | if (ref->next_in_ino) | |
297 | jffs2_remove_node_refs_from_ino_list(c, ref, jeb); | |
298 | /* else it was a non-inode node or already removed, so don't bother */ | |
299 | ||
300 | jffs2_free_raw_node_ref(ref); | |
301 | } | |
302 | jeb->last_node = NULL; | |
303 | } | |
304 | ||
305 | static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) | |
306 | { | |
307 | struct jffs2_raw_node_ref *marker_ref = NULL; | |
308 | unsigned char *ebuf; | |
309 | size_t retlen; | |
310 | int ret; | |
311 | uint32_t bad_offset; | |
312 | ||
313 | if (!jffs2_cleanmarker_oob(c)) { | |
314 | marker_ref = jffs2_alloc_raw_node_ref(); | |
315 | if (!marker_ref) { | |
316 | printk(KERN_WARNING "Failed to allocate raw node ref for clean marker\n"); | |
317 | /* Stick it back on the list from whence it came and come back later */ | |
318 | jffs2_erase_pending_trigger(c); | |
319 | spin_lock(&c->erase_completion_lock); | |
320 | list_add(&jeb->list, &c->erase_complete_list); | |
321 | spin_unlock(&c->erase_completion_lock); | |
322 | return; | |
323 | } | |
324 | } | |
325 | ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
326 | if (!ebuf) { | |
327 | printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Assuming it worked\n", jeb->offset); | |
328 | } else { | |
329 | uint32_t ofs = jeb->offset; | |
330 | ||
331 | D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset)); | |
332 | while(ofs < jeb->offset + c->sector_size) { | |
333 | uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs); | |
334 | int i; | |
335 | ||
336 | bad_offset = ofs; | |
337 | ||
338 | ret = jffs2_flash_read(c, ofs, readlen, &retlen, ebuf); | |
339 | if (ret) { | |
340 | printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret); | |
341 | goto bad; | |
342 | } | |
343 | if (retlen != readlen) { | |
344 | printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen); | |
345 | goto bad; | |
346 | } | |
347 | for (i=0; i<readlen; i += sizeof(unsigned long)) { | |
348 | /* It's OK. We know it's properly aligned */ | |
349 | unsigned long datum = *(unsigned long *)(&ebuf[i]); | |
350 | if (datum + 1) { | |
351 | bad_offset += i; | |
352 | printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", datum, bad_offset); | |
353 | bad: | |
354 | if (!jffs2_cleanmarker_oob(c)) | |
355 | jffs2_free_raw_node_ref(marker_ref); | |
356 | kfree(ebuf); | |
357 | bad2: | |
358 | spin_lock(&c->erase_completion_lock); | |
359 | /* Stick it on a list (any list) so | |
360 | erase_failed can take it right off | |
361 | again. Silly, but shouldn't happen | |
362 | often. */ | |
363 | list_add(&jeb->list, &c->erasing_list); | |
364 | spin_unlock(&c->erase_completion_lock); | |
365 | jffs2_erase_failed(c, jeb, bad_offset); | |
366 | return; | |
367 | } | |
368 | } | |
369 | ofs += readlen; | |
370 | cond_resched(); | |
371 | } | |
372 | kfree(ebuf); | |
373 | } | |
374 | ||
375 | bad_offset = jeb->offset; | |
376 | ||
377 | /* Write the erase complete marker */ | |
378 | D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset)); | |
379 | if (jffs2_cleanmarker_oob(c)) { | |
380 | ||
381 | if (jffs2_write_nand_cleanmarker(c, jeb)) | |
382 | goto bad2; | |
383 | ||
384 | jeb->first_node = jeb->last_node = NULL; | |
385 | ||
386 | jeb->free_size = c->sector_size; | |
387 | jeb->used_size = 0; | |
388 | jeb->dirty_size = 0; | |
389 | jeb->wasted_size = 0; | |
390 | } else { | |
391 | struct kvec vecs[1]; | |
392 | struct jffs2_unknown_node marker = { | |
393 | .magic = cpu_to_je16(JFFS2_MAGIC_BITMASK), | |
394 | .nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER), | |
395 | .totlen = cpu_to_je32(c->cleanmarker_size) | |
396 | }; | |
397 | ||
398 | marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4)); | |
399 | ||
400 | vecs[0].iov_base = (unsigned char *) ▮ | |
401 | vecs[0].iov_len = sizeof(marker); | |
402 | ret = jffs2_flash_direct_writev(c, vecs, 1, jeb->offset, &retlen); | |
403 | ||
404 | if (ret) { | |
405 | printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n", | |
406 | jeb->offset, ret); | |
407 | goto bad2; | |
408 | } | |
409 | if (retlen != sizeof(marker)) { | |
410 | printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n", | |
411 | jeb->offset, sizeof(marker), retlen); | |
412 | goto bad2; | |
413 | } | |
414 | ||
415 | marker_ref->next_in_ino = NULL; | |
416 | marker_ref->next_phys = NULL; | |
417 | marker_ref->flash_offset = jeb->offset | REF_NORMAL; | |
418 | marker_ref->__totlen = c->cleanmarker_size; | |
419 | ||
420 | jeb->first_node = jeb->last_node = marker_ref; | |
421 | ||
422 | jeb->free_size = c->sector_size - c->cleanmarker_size; | |
423 | jeb->used_size = c->cleanmarker_size; | |
424 | jeb->dirty_size = 0; | |
425 | jeb->wasted_size = 0; | |
426 | } | |
427 | ||
428 | spin_lock(&c->erase_completion_lock); | |
429 | c->erasing_size -= c->sector_size; | |
430 | c->free_size += jeb->free_size; | |
431 | c->used_size += jeb->used_size; | |
432 | ||
433 | ACCT_SANITY_CHECK(c,jeb); | |
434 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
435 | ||
436 | list_add_tail(&jeb->list, &c->free_list); | |
437 | c->nr_erasing_blocks--; | |
438 | c->nr_free_blocks++; | |
439 | spin_unlock(&c->erase_completion_lock); | |
440 | wake_up(&c->erase_wait); | |
441 | } | |
442 |